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A medical worker of Tokyo Medical Center receives a booster shot of the Pfizer COVID-19 vaccine Wednesday, Dec. 1, 2021, in Tokyo. Japan has started administering the booster shots to health care workers on Wednesday. (Kyodo News via AP)

A medical worker of Tokyo Medical Center receives a booster shot of the Pfizer COVID-19 vaccine Wednesday, Dec. 1, 2021, in Tokyo. Japan has started administering the booster shots to health care workers on Wednesday. (Kyodo News via AP)

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